The hills beckon this off-road-equipped SUV, which features a pampering, leather-trimmed cabin with enough technology to appeal to Silicon Valley CEOs and 38% more horsepower than the 2010 model.

A thought crossed my mind as I rolled the 2011 Jeep Grand Cherokee over what appeared to be the edge of a cliff: "Why am I doing this?"

Before my nose dive down the cartoonishly steep and rocky grade of the Hollister Hills State Vehicular Recreation Area in Monterey County, my impression of modern Jeeps was that the "S" had been stripped from these SUVs — that there was little sport involved in these supposed utility vehicles. Jeep may have been bred for war, but the only thing resembling military action I'd seen involving the five-seat Grand Cherokee was the mobilization of soccer moms shuttling their kids to practice and hauling rations from Costco.

So when the new Grand Cherokee not only made it down the hill but did so without any heavy breathing — either on my part or the vehicle's — I was impressed.

Having received a taxpayer loan in 2009 and emerging from bankruptcy later in the year, Chrysler has a lot on the line with its Jeep brand. The Grand Cherokee is the Jeep flagship.

With its first update in 5 1/2 years, the Grand Cherokee is hitting the market with its six cylinders firing and its four-wheel drive fully engaged. It's an impressive machine inside and out. A steel uniframe shell protects a pampering, leather-trimmed cabin with enough technology to appeal to Silicon Valley CEOs, while under the hood, the all-new Pentastar 3.6-liter V-6 boasts an 11% improvement in fuel economy (22 highway/16 city for the four-wheel drive version), an 11% increase in torque and a 38% upgrade in horsepower over the 2010 model.

According to Jeep, just 10% of Grand Cherokee owners will ever pop the curb and take their rides off-road into the untamed and thoroughly brambled outdoors. But it's the technology designed to appeal to that minority that is this Jeep's most impressive feature.

New to various versions of the $31,000-plus 2011 Grand Cherokee is an optional Quadra-Lift air suspension system, which I had on the Limited 4x4 version I tested. At the push of a button, the chassis lifts 1.3 inches for light off-roading and doubles the lift for more challenging tasks, such as fording streams and clambering over boulders. It also drops down in park mode, so passengers, after a long day of into-the-wild hoots and hollers, can step out without breaking a leg.

With the previous three incarnations of the Grand Cherokee, the strategy had been to hide the car's technological trickery from the driver.For 2011, there's a more hands-on interface. The Quadra-Lift accommodates a suspension range of 4.1 to 10.7 inches in five settings and works in tandem with a new Selec-Terrain traction system, which lets drivers set the vehicle to certain driving conditions. Traversing snow, rocks or sand is managed with the simple turn of a knob that electronically coordinates the powertrain, braking and suspension systems, as well as the throttle, transmission shift and stability controls, among other things.

The Grand Cherokee's Quadra-Lift Selec-Terrain system is very similar to the four-corner electronic air suspension used by Tata Motors' Land Rover brand, which caters to an even more rarefied if equally off-road-unlikely clientele. But all's fair in love and war, it seems, especially in today's automotive climate. I've taken both the Land Rover LR4 and the Jeep Grand Cherokee off road, and I'd say the systems are equally impressive, though they operate slightly differently: the Land Rover with air from the atmosphere and the Jeep's from a sealed tank. With both SUVs, I half-expected to see legs, rather than tires, propelling me as I scaled boulders and climbed railroad ties, powered through sand and descended hills so steep that at times I couldn't even see where my wheels would catch.

In addition to the terrain drive modes, Jeep has followed Land Rover with yet another piece of high-tech wizardry — a hill-descent control feature that relieves drivers of the need to use their brakes since the car does so automatically when needed. Heading downward, on steep grades, it applies the brakes to each wheel individually, preventing the SUV from succumbing to gravity's mercy.

Urbanites who have no intention of heading off road will also enjoy this Jeep, which has creature comforts for "glampers" who'd never think of roughing it in a tent.

I'd spent the morning hours of my day with the Grand Cherokee driving it through San Francisco and the canyons just south of the city, enjoying its leather interior, heated wood steering wheel and other amenities. The tactile nature and attention to detail displayed in the Grand Cherokee interior were far more elegant than I expected from a brand originally designed for the military.